diff --git a/cache/queue.go b/cache/queue.go
new file mode 100644
index 0000000..4055cce
--- /dev/null
+++ b/cache/queue.go
@@ -0,0 +1,57 @@
+package cache
+
+type Cache struct {
+	cache []byte
+	l     int //length of content, not length of slice.
+}
+
+type QueueCache struct { //FIFO
+	queue chan *Cache
+}
+
+type BlockingQueueCache QueueCache  
+
+type UnblockingQueueCache QueueCache  
+
+func NewUnblockingQueueCache(quN int) *UnblockingQueueCache {
+	t := &UnblockingQueueCache{
+		queue: make(chan *Cache, quN),
+	}
+	return t
+}
+
+func (this *UnblockingQueueCache) Put(bits []byte, l int) {
+	this.queue <- &Cache{
+		cache: bits,
+		l:     l,
+	}
+}
+
+func (this *UnblockingQueueCache) Get() ([]byte, int) {
+	var t *Cache
+	select {
+	case t = <-this.queue:
+	default:
+		return make([]byte, 1024*4), 1024 * 4
+	}
+	return t.cache, t.l
+}
+
+func NewBlockingQueueCache(quN int) *BlockingQueueCache {
+	t := &BlockingQueueCache{
+		queue: make(chan *Cache, quN),
+	}
+	return t
+}
+
+func (this *BlockingQueueCache) Put(bits []byte, l int) {
+	this.queue <- &Cache{
+		cache: bits,
+		l:     l,
+	}
+}
+
+func (this *BlockingQueueCache) Get() ([]byte, int) {
+	 t := <-this.queue
+	return t.cache, t.l
+}
\ No newline at end of file
diff --git a/main_test.go b/main_test.go
index bc6133b..00d321e 100644
--- a/main_test.go
+++ b/main_test.go
@@ -2,7 +2,7 @@ package main
 
 import (
 	"bufio"
-	"fmt"
+	// "fmt"
 	"github.com/TransX/log"
 	"github.com/TransX/protocol"
 	"io"
@@ -10,6 +10,7 @@ import (
 	"os"
 	"testing"
 	"time"
+	"fmt"
 )
 
 func serverBin(t *testing.T) {
@@ -17,7 +18,7 @@ func serverBin(t *testing.T) {
 	reader := bufio.NewReader(file)
 	listener, err := net.Listen("tcp4", "127.0.0.1:1244")
 	if err != nil {
-		t.Fatal(err)
+		log.Error("Test Server %s",err.Error())
 	}
 	var nCount byte
 	nCount = 0
@@ -42,6 +43,10 @@ func serverBin(t *testing.T) {
 			}
 			log.Info("Test Server read per time %d", n)
 			////<-
+			if add+n >= len(bytes) {
+				log.Panic("serverBin reseive out of bound n:%d,add+n :%d", n, add+n)
+				break
+			}
 			copy(bytes[add:add+n], _bytes[:n])
 			add += n
 			log.Info("add %d from %s", add, conn.RemoteAddr().String())
@@ -94,9 +99,9 @@ func serverBin(t *testing.T) {
 		log.Info("Test Server. All Matches.")
 		//		log.Info("Test Server Receive %s", string(bytes[:n]))
 		_, err = conn.Write([]byte("OK"))
-		log.Info("Test Server write")
+		log.Info("Test Server write OK from %s to %s",conn.LocalAddr().String(),conn.RemoteAddr().String(),)
 		if err != nil {
-			t.Fatal(err)
+			log.Error("Test Server %s ",err.Error())
 		}
 		conn.Close()
 		log.Info("Test Server closed")
@@ -150,12 +155,16 @@ func clientBin(t *testing.T) {
 	for {
 		conn, err := net.Dial("tcp4", "127.0.0.1:1200")
 		if err != nil {
-			t.Fatal(err)
+			log.Error("Test Client %s",err.Error())
 		}
 		binBytes := make([]byte, 1024*4)
 		nBinBytes, err := reader.Read(binBytes)
 		if err != nil {
-			log.Error("client read %", err)
+			if err==io.EOF{
+				fmt.Println("Test Finished.")
+				break
+			}
+			log.Error("client read %s", err.Error())
 
 		}
 		toBinWrite := make([]byte, len(binBytes)+1)
@@ -165,21 +174,17 @@ func clientBin(t *testing.T) {
 		if n != nBinBytes+1 {
 			log.Error("client not write enough bytes")
 		}
-		//		log.Info("Test Client write %s", string(binBytes[:n]))
 		log.Info("Test Client write %d bytes with count %d", n, nCount)
 		nCount++
 		bytes := make([]byte, 1024*32)
 		n, err = conn.Read(bytes)
-		log.Info("Test Client read")
+		log.Info("Test Client read % bytes (local add %s) msg:%s from %s",n,conn.LocalAddr().String(),bytes[:n],conn.RemoteAddr().String())
 		if err != nil {
-			t.Fatal(err)
+			log.Error("Test Client %s",err.Error())
 		}
-		log.Info("Test Client Receive %s", bytes[:n])
-		fmt.Println("Test Client Receive ", string(bytes[:n]))
-		time.Sleep(time.Second * 2)
+		time.Sleep(time.Second * 0)
 		conn.Close()
 		log.Info("Test Client closed")
-
 	}
 }
 
@@ -206,7 +211,7 @@ func clientText(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		log.Info("Test Client Receive %s", bytes[:n])
+		// log.Info("Test Client Receive %s", bytes[:n])
 		time.Sleep(time.Second * 2)
 		conn.Close()
 		log.Info("Test Client closed")
diff --git a/protocol/tunnel.go b/protocol/tunnel.go
index e63db6f..db6c49a 100644
--- a/protocol/tunnel.go
+++ b/protocol/tunnel.go
@@ -5,6 +5,7 @@ import (
 	"crypto/md5"
 	"encoding/hex"
 	// "fmt"
+	"github.com/TransX/cache"
 	"github.com/TransX/log"
 	"github.com/TransX/tscipher"
 	"net"
@@ -63,9 +64,10 @@ func (this *Tunnel) Run() { //单向的，从src发送到dest
 	id := this.id
 	// cache := make([]byte, 1024*4) //4kB
 	//构建Carrier
-	queCache := tscipher.NewQueueCache(1)
-	revCarrier := tscipher.NewCarrier(src, tscipher.NewCipher("XOR"), queCache, id)
-	sendCarrier := tscipher.NewCarrier(dest, tscipher.NewCipher("XOR"), queCache, id)
+	queCache := cache.NewUnblockingQueueCache(1)
+	msg := cache.NewBlockingQueueCache(1)
+	revCarrier := tscipher.NewCarrier(src, tscipher.NewCipher("XOR"), queCache, msg, id)
+	sendCarrier := tscipher.NewCarrier(dest, tscipher.NewCipher("XOR"), queCache, msg, id)
 	//timer
 
 	// for {
@@ -111,7 +113,7 @@ func (this *Tunnel) receive(revCarrier *tscipher.Carrier) {
 		if err != nil {
 			log.Panic("Read panic. Tunnel id: %s. Remote Add: %s Local: %s. Err:%s", id, src.RemoteAddr().String(), src.LocalAddr().String(), err.Error())
 		}
-		log.Debug("Reived %d bytes from %s. Tunnel: id %s", n, src.RemoteAddr().String(), id)
+		log.Debug("Reived %d bytes (local add %s) from %s. Tunnel: id %s", n, src.LocalAddr().String(),src.RemoteAddr().String(), id)
 		// nCh <- n
 	}
 }
@@ -143,7 +145,7 @@ func (this *Tunnel) send(sendCarrier *tscipher.Carrier) {
 		sTimer := time.Now() //send timer
 		_, err := tscipher.SendData(sendCarrier)
 		// fmt.Println("send")
-		log.Info("id %s time to sned %d", id, time.Since(sTimer)/1000)
+		log.Info("id %s time to send %d", id, time.Since(sTimer)/1000)
 		if err != nil {
 			log.Panic("Write panic. ID: %s, Err: %s, Remote Add: %s", id, err, dest.RemoteAddr().String())
 		}
diff --git a/tscipher/cipher.go b/tscipher/cipher.go
index 51e99d7..8cd4b44 100644
--- a/tscipher/cipher.go
+++ b/tscipher/cipher.go
@@ -3,6 +3,7 @@ package tscipher
 import (
 	"bytes"
 	"fmt"
+	"github.com/TransX/cache"
 	"github.com/TransX/log"
 	"github.com/TransX/utils"
 	"io"
@@ -11,38 +12,6 @@ import (
 	"strings"
 )
 
-type Cache struct {
-	cache []byte
-	l     int //length, not capability
-}
-
-type QueueCache struct { //FIFO
-	queue chan *Cache
-}
-
-func NewQueueCache(quN int) *QueueCache {
-	t := &QueueCache{
-		queue: make(chan *Cache, quN),
-	}
-	return t
-}
-
-func (this *QueueCache) Put(bits []byte, l int) {
-	// fmt.Printf("len of chan Put %d\n", len(this.queue))
-	this.queue <- &Cache{
-		cache: bits,
-		l:     l,
-	}
-	// fmt.Printf("QueueCache put %d\n", len(this.queue))
-}
-
-func (this *QueueCache) Get() ([]byte, int) {
-	// fmt.Printf("len of chan Get %d\n", len(this.queue))
-	t := <-this.queue
-	// fmt.Printf("QueueCache got %d\n", len(this.queue))
-	return t.cache, t.l
-}
-
 var StartMark = []byte("#2v!") //should be constant
 var EndMark = []byte("_=1z")   //should be constant
 
@@ -71,23 +40,25 @@ type Carrier struct {
 	Conn   net.Conn
 	Cipher Cipher
 	// Cache            []byte
-	Cache            *QueueCache
+	Cache            *cache.UnblockingQueueCache
+	Msg              *cache.BlockingQueueCache
 	AttachedTunnelID string
 	receiveBuff      []byte
 }
 
-func NewCarrier(conn net.Conn, cipher Cipher, queCache *QueueCache, id string) *Carrier {
+func NewCarrier(conn net.Conn, cipher Cipher, queCache *cache.UnblockingQueueCache, msg *cache.BlockingQueueCache, id string) *Carrier {
 	t := new(Carrier)
 	t.Conn = conn
 	t.Cipher = cipher
 	t.Cache = queCache
+	t.Msg = msg
 	t.AttachedTunnelID = id
 	t.receiveBuff = make([]byte, 0, 1024*4)
 	return t
 }
 
 func (this *Carrier) GetReceiveBuff() []byte {
-	log.Debug("id %d receivebuff Get, len %d", this.AttachedTunnelID, len(this.receiveBuff))
+	// log.Debug("id %d receivebuff Get, len %d", this.AttachedTunnelID, len(this.receiveBuff))
 	buff := this.receiveBuff
 	_b := make([]byte, len(buff), cap(buff)) //必须这样写，没错。
 	copy(_b, buff)
@@ -96,7 +67,7 @@ func (this *Carrier) GetReceiveBuff() []byte {
 
 func (this *Carrier) SetReceiveBuff(buff []byte) {
 	this.receiveBuff = buff
-	log.Debug("id %d receivebuff set, len %d", this.AttachedTunnelID, len(this.receiveBuff))
+	// log.Debug("id %d receivebuff set, len %d", this.AttachedTunnelID, len(this.receiveBuff))
 }
 
 func NewCipher(cipherName string) (cipher Cipher) {
@@ -173,16 +144,18 @@ func UnwrapPackage(pacakge []byte) (data []byte, rest []byte, err error) {
 }
 
 func SendData(carrier *Carrier) (n int, err error) {
-	cache, nByte := carrier.Cache.Get()
+	// cache, nByte := carrier.Cache.Get()
+	msg, nByte := carrier.Msg.Get()
+	// fmt.Printf("SendData id %s get msg %d\n", carrier.AttachedTunnelID, nByte)
 	// fmt.Printf("id %s get cache\n", carrier.AttachedTunnelID)
-	if len(cache) < nByte {
+	if len(msg) < nByte {
 		log.Panic("Cache of send is too small")
 	}
 	if carrier.Cipher == nil {
-		n, err = carrier.Conn.Write(cache[:nByte])
+		n, err = carrier.Conn.Write(msg[:nByte])
 		return
 	}
-	encrypedByte, err := carrier.Cipher.Encrypt(cache[:nByte])
+	encrypedByte, err := carrier.Cipher.Encrypt(msg[:nByte])
 	if err != nil {
 		n = 0
 		return
@@ -190,19 +163,24 @@ func SendData(carrier *Carrier) (n int, err error) {
 	//打包
 	wraped := WrapPackage(encrypedByte[:nByte])
 	n, err = carrier.Conn.Write(wraped)
-	log.Debug("Ready to write id %s, 18 byte %s", carrier.AttachedTunnelID, string(wraped[:18]))
+	// log.Debug("Ready to write id %s, 18 byte %s", carrier.AttachedTunnelID, string(wraped[:18]))
 	// copy(carrier.Cache, encrypedByte[:nByte]) // in case of debugging
+	// carrier.Cache.Put(msg, len(msg))
+	carrier.Cache.Put(make([]byte, 1024*4), 1024*4)
+	// fmt.Printf("SendData %s id put cache\n", carrier.AttachedTunnelID)
 	return
 }
 
 func RowReceiveData(carrier *Carrier) (n int, err error) {
-	cache := make([]byte, 1024*4)
+	cache, _ := carrier.Cache.Get()
+	// fmt.Printf("RowReceiveData id %s get cache\n", carrier.AttachedTunnelID)
 	n, err = carrier.Conn.Read(cache)
 	if err != nil {
 		n = 0
 	}
-	carrier.Cache.Put(cache, n)
-	// fmt.Printf("id %s put cache\n", carrier.AttachedTunnelID)
+	// carrier.Cache.Put(cache, n)
+	// fmt.Printf("RowReceiveData id %s pet msg\n", carrier.AttachedTunnelID)
+	carrier.Msg.Put(cache, n)
 	return
 }
 
@@ -212,11 +190,11 @@ func ReceiveData(carrier *Carrier) (n int, err error) {
 	// 		log.Error("ReceiveData err %s", r)
 	// 	}
 	// }()
-	log.Debug("id %s wrapedPackage := carrier.GetReceiveBuff()", carrier.AttachedTunnelID)
+	// log.Debug("id %s wrapedPackage := carrier.GetReceiveBuff()", carrier.AttachedTunnelID)
 	wrapedPackage := carrier.GetReceiveBuff() //make([]byte, 0, cap(carrier.Cache))
 	var packageData []byte
 	var _rest []byte
-	cache := make([]byte, 1024*4)
+	cache, _ := carrier.Cache.Get()
 	for {
 		//首先检查这个是不是完整的包，是就返回好了，免得被阻塞
 		data, rest, err := UnwrapPackage(wrapedPackage)
@@ -226,28 +204,27 @@ func ReceiveData(carrier *Carrier) (n int, err error) {
 			log.Debug("return NotPackageError %s", carrier.AttachedTunnelID)
 			return 0, err
 		}
-		log.Debug("id %s length of package %d", carrier.AttachedTunnelID, len(packageData))
+		// log.Debug("id %s length of package %d", carrier.AttachedTunnelID, len(packageData))
 		if err == nil {
 			//够一个完整的包
-			log.Debug("id %s capBuff := cap(carrier.GetReceiveBuff())", carrier.AttachedTunnelID)
 			capBuff := cap(carrier.GetReceiveBuff())
 			_buff := make([]byte, 0, capBuff) //释放
 			_buff = append(_buff, _rest...)
-			log.Debug("id %s carrier.SetReceiveBuff(_buff)", carrier.AttachedTunnelID)
+			// log.Debug("id %s carrier.SetReceiveBuff(_buff)", carrier.AttachedTunnelID)
 			carrier.SetReceiveBuff(_buff)
 			break
 		}
 		//如果读到的数据不够一个完整的包
-		log.Debug("id %s to read wrapedPackage %d", carrier.AttachedTunnelID, len(wrapedPackage))
+		// log.Debug("id %s to read wrapedPackage %d", carrier.AttachedTunnelID, len(wrapedPackage))
 		if len(wrapedPackage) > 0 {
 			n, err = carrier.Conn.Read(cache)
 			if err != nil {
 				log.Error("ERROR %s", err)
 			}
-			log.Debug("id %s to Conn.Read %d", carrier.AttachedTunnelID, n)
+			// log.Debug("id %s to Conn.Read %d", carrier.AttachedTunnelID, n)
 		} else {
 			n, err = io.ReadAtLeast(carrier.Conn, cache, 18)
-			log.Debug("id %s to ReadAtLeast", carrier.AttachedTunnelID)
+			// log.Debug("id %s to ReadAtLeast", carrier.AttachedTunnelID)
 		}
 
 		if err != nil {
@@ -256,15 +233,15 @@ func ReceiveData(carrier *Carrier) (n int, err error) {
 		}
 		wrapedPackage = append(wrapedPackage, cache[:n]...)
 
-		log.Debug("id %s length of conn %d", carrier.AttachedTunnelID, n)
-		log.Debug("id %s first 18 %s from %s", carrier.AttachedTunnelID, string(wrapedPackage[:18]), carrier.Conn.RemoteAddr().String())
+		// log.Debug("id %s length of conn %d", carrier.AttachedTunnelID, n)
+		// log.Debug("id %s first 18 %s from %s", carrier.AttachedTunnelID, string(wrapedPackage[:18]), carrier.Conn.RemoteAddr().String())
 
 	}
 
-	if len(carrier.GetReceiveBuff()) > 0 {
-		log.Debug("id %s trailing %d from %s", carrier.AttachedTunnelID, len(carrier.GetReceiveBuff()), carrier.Conn.RemoteAddr().String())
-		log.Debug("id %s 18 byte of trailing %s", carrier.AttachedTunnelID, string(carrier.GetReceiveBuff()[:18]))
-	}
+	// if len(carrier.GetReceiveBuff()) > 0 {
+	// 	log.Debug("id %s trailing %d from %s", carrier.AttachedTunnelID, len(carrier.GetReceiveBuff()), carrier.Conn.RemoteAddr().String())
+	// 	log.Debug("id %s 18 byte of trailing %s", carrier.AttachedTunnelID, string(carrier.GetReceiveBuff()[:18]))
+	// }
 	decrypted, err := carrier.Cipher.Decrypt(packageData)
 	if err != nil {
 		n = 0
@@ -272,7 +249,9 @@ func ReceiveData(carrier *Carrier) (n int, err error) {
 	}
 	n = len(decrypted)
 	// copy(cache, decrypted)
-	carrier.Cache.Put(decrypted, n)
+	// carrier.Cache.Put(decrypted, n)
+	// fmt.Printf("ReceiveData id %s get msg\n", carrier.AttachedTunnelID)
+	carrier.Msg.Put(decrypted, n)
 	// fmt.Printf("id %s put cache\n", carrier.AttachedTunnelID)
 	return
 }